Abstract
Global Navigation Satellite System (GNSS) receivers are now widely used for navigation and speed measurements. The majority of manufacturers of chipsets and receivers claim that their products are accurate to about 0.1 km/h in measuring speed. Therefore, it is a metrological challenge to test GNSS receivers in real world environments as test vehicles are generally not capable to provide such accuracy. The datasheets for GNSS receivers, however, provide no information about specific conditions when the claimed speed accuracy might be achieved. Limited practical research activities with traceable to national standards test vehicles were conducted to reveal the practical speed accuracy parameters of GNSS receivers in different conditions. This research firstly aims to design and implement an electronic system for a test vehicle which would generate speed records with high accuracy and traceability to national standards. High accuracy of the test vehicle and synchronization of its speed records with Universal Coordinated Time allowed conducting subsequent testing of GNSS receivers of different complexities for speed. Test results demonstrate that different GNSS receivers have different speed accuracy parameters both statistically and in regards to generation of outliers. GNSS environmental factors should be taken into consideration when relying on individual speed measurements.
Highlights
Nowadays companies and individuals use Global Positioning System (GPS) and Global Navigation Satellite System (GNSS) receivers or devices based on GNSS technology in a number of applications
The first challenge relates to high accuracy in speed measurements claimed by the manufacturers of GNSS chipsets and receivers in the relevant datasheets
The second challenge is linked to the necessity of timing synchronization between the test vehicle speed records and speed records generated by GNSS receivers
Summary
Nowadays companies and individuals use Global Positioning System (GPS) and Global Navigation Satellite System (GNSS) receivers or devices based on GNSS technology in a number of applications. Victoria Police in Australia has the following warning to people who may want to use GPS speed trying to challenge speed fines: Quote: “Cruise control and GPS systems are not scientifically tested or certified speed measuring devices and can be subject to faults and errors. It remains the driver's responsibility to stay within the speed limit” – End of Quote. There are no standards on GNSS speed testing and no benchmarks on how the test vehicles should look like to be able to test GNSS for speed, what the accuracy and uncertainty of measurement (UOM) of such test vehicles should be and how speed records generated by this test vehicles should be synchronized with Universal Coordinated Time (UTC) computed by GNSS receivers
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